Emit, even in the presence of declaration errors and noEmitOnError.

We're reverting to the previous behavior we had until there is more consensus
on the best way to deal with this issue.

src/compiler/program.ts

@@ -87,11 +87,6 @@ module ts {
 
     export function getPreEmitDiagnostics(program: Program): Diagnostic[] {
         let diagnostics = program.getSyntacticDiagnostics().concat(program.getGlobalDiagnostics()).concat(program.getSemanticDiagnostics());
-
-        if (program.getCompilerOptions().declaration) {
-            diagnostics.concat(program.getDeclarationDiagnostics());
-        }
-
         return sortAndDeduplicateDiagnostics(diagnostics);
     }